Commonest site used for IM injection in infant is?

AIIMS Rishikesh & Jodhpur NO - 2017

Child Health Nursing (Pediatrics)

Easy

Appeared in: AIIMS Rishikesh & Jodhpur NO - 2017

Explanation

The vastus lateralis muscle is the recommended and most common site for IM injections in infants.
This muscle is well-developed at birth, providing a large and safe area for medication administration.
It is located on the anterolateral aspect of the thigh, away from major nerves and blood vessels, minimizing the risk of injury.
The maximum volume for injection in this site for infants is typically 0.5 mL for smaller infants and up to 1 mL for older infants.

Option B: The gluteal muscles (dorsogluteal site) are not recommended for infants because they are underdeveloped and poorly absorb medication. More importantly, the sciatic nerve is large and located close to the surface, creating a high risk of permanent nerve damage and paralysis if hit.
Option C: The deltoid muscle is very small in infants and not developed enough to handle most IM injections safely. The volume that can be administered is minimal (less than 0.5 mL), and there is a risk of injuring the radial and axillary nerves.
Option D: The triceps muscle is not a standard or recommended site for routine intramuscular injections in any age group. It is not used due to the proximity of major nerves (radial nerve) and blood vessels (brachial artery).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Intramuscular (IM) injection sites in infants as background academic context rather than a clinical decision trigger.
Correct site selection is a fundamental nursing skill that directly impacts patient safety. Choosing the wrong site in an infant can lead to severe and permanent complications, including nerve damage, paralysis, and poor drug efficacy.
Nurses must educate parents about the chosen injection site and the reasons for it, especially when parents question why the thigh is used instead of the buttock, which they may be more familiar with from adult injections.
What if? If an infant requires multiple simultaneous injections (e.g., for routine immunizations), the nurse can use both vastus lateralis muscles (one on each thigh) or use the vastus lateralis and the ventrogluteal site if appropriate for the infant's size and agency policy.

How to Approach the Question

First, identify the core of the question: it asks for the 'commonest' or most appropriate IM injection site for a specific age group, which is 'infants'.
Recall the anatomical and developmental differences between infants and adults. Infants have different muscle development and nerve locations.
Evaluate each option based on pediatric nursing principles:
Vastus lateralis: Is it large and safe in an infant? Yes, it's the most developed muscle.
Gluteal: Is it safe? No, the sciatic nerve is a major risk.
Deltoid: Is it large enough? No, it's too small in infants.

Concept Tested & Keywords

Concept Tested: Intramuscular (IM) injection sites in infants.
Stem keywords: IM injection, infant, commonest site
Lead-in keywords: BEST, MOST RELEVANT CLUE
Clinical cues: The patient's age (infant) is the most critical factor in determining the appropriate injection site.

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